Ocean ship tail gas denitration method by combination of air supply local discharging oxidation and sea water washing

Abstract

The invention discloses an ocean ship tail gas denitration method by combination of air supply local discharging oxidation and sea water washing, belonging to the field of air pollution control and ocean ship tail gas emission control. Tail gas sequentially passes through an air supply region, a discharging oxidation region and a sea water washing region, thus completing tail gas denitration. The air supply region composed of a blower and a gas mixing pipeline increases the concentration of oxygen in tail gas; the local discharging oxidation region composed of plasma generators causes NO to be converted into NO2 and N2O5 by oxidizing substance; the sea water washing region composed of a sea water washing tower, filler and a sea water pump causes the NO2 and N2O5 to be converted into nitrate, and tail gas and washing water which are up to the standard are discharged. The ocean ship tail gas denitration system formed by utilizing the invention has the advantages that energy consumption is low, volume is small, price is low, and product can be directly emitted to the ocean.

Description

technical field [0001] The invention relates to a method for denitrification of tail gas of marine ships, in particular to a method for denitrification of tail gas of marine ships, which integrates two processes of in-situ discharge oxidation and seawater washing into one, and belongs to air pollution control and marine ship tail gas the field of emission control. Background technique [0002] The fuel oil in marine diesel engines will produce nitrogen oxides (more than 95% are nitrogen monoxide NO) after high-temperature combustion. Pollution like motor vehicle exhaust. The 57th meeting of the Marine Environmental Protection Committee of the International Maritime Organization passed the amendment to the new appendix VI of the MARPOL73 / 78 Convention, in which the Tier III emission limits for nitrogen oxides are very strict, which is far beyond what can be achieved by simply improving the combustion process of diesel engines Therefore, referring to the denitrification of c...

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Problems solved by technology

[0005] However, there is still an important problem in this ozone oxidation combined with seawater washing process: the ozone generator required by this process has too much power consumption, is bulky and expensive

Taking a 3000kW marine diesel engine as an example, if the NO emission in the exhaust gas is 11g / (kW.h), then according to O 3 According to the principle of mole number: NO mole number=1:1, the output of the ozone generator required to oxidize NO should be calculated to be 52.8kg / h, while the current ozone output is the power of a large-scale commercial oxygen source ozone generator of 50kg / h It is 400kW, the overall size is 4900mm×4000mm×3000mm, and the price exceeds 4 million yuan. It can be seen that if this process is adopted, the power consumption of the oxygen source ozone generator alone accounts for 13.33% of the power of the diesel engine. If the air source ozone generator is used , then its power consumption will be doubled. In addition, it can be seen that the ozone generator is bulky and expensive

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